Update the WordPress BCS BatchLine Book Importer plugin to the latest available version (at least 1.5.8).
An unknown person discovered and reported this Arbitrary File Upload vulnerability in WordPress BCS BatchLine Book Importer Plugin. This could allow a malicious actor to upload any type of file to your website. This can include backdoors which are then executed to gain further access to your website. This vulnerability has been fixed in version 1.5.8.
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